<?php

if (class_exists('ParagonIE_Sodium_Core_XSalsa20', false)) {
    return;
}

/**
 * Class ParagonIE_Sodium_Core_XSalsa20
 */
abstract class ParagonIE_Sodium_Core_XSalsa20 extends ParagonIE_Sodium_Core_HSalsa20
{
    /**
     * Expand a key and nonce into an xsalsa20 keystream.
     *
     * @internal You should not use this directly from another application
     *
     * @param int $len
     * @param string $nonce
     * @param string $key
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function xsalsa20($len, $nonce, $key)
    {
        $ret = self::salsa20(
            $len,
            self::substr($nonce, 16, 8),
            self::hsalsa20($nonce, $key)
        );
        return $ret;
    }

    /**
     * Encrypt a string with XSalsa20. Doesn't provide integrity.
     *
     * @internal You should not use this directly from another application
     *
     * @param string $message
     * @param string $nonce
     * @param string $key
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function xsalsa20_xor($message, $nonce, $key)
    {
        return self::xorStrings(
            $message,
            self::xsalsa20(
                self::strlen($message),
                $nonce,
                $key
            )
        );
    }
}

• [D] Base64
• [D] ChaCha20
• [D] Curve25519
• [D] Poly1305
• [D] SecretStream
• [F] BLAKE2b.php
  Delete
• [F] ChaCha20.php
  Delete
• [F] Curve25519.php
  Delete
• [F] Ed25519.php
  Delete
• [F] HChaCha20.php
  Delete
• [F] HSalsa20.php
  Delete
• [F] Poly1305.php
  Delete
• [F] Ristretto255.php
  Delete
• [F] Salsa20.php
  Delete
• [F] SipHash.php
  Delete
• [F] Util.php
  Delete
• [F] X25519.php
  Delete
• [F] XChaCha20.php
  Delete
• [F] XSalsa20.php
  Delete

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